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Published online by Cambridge University Press: 07 February 2017
Four ultraviolet fluxes measured in U2 (centered at λeff 2300 Å) by the Celescope experiment aboard OAO 2, reveal an important flux difference between Pleiades and Hyades stars. Available blanketed stellar models show that the difference is too large to be understood as a blocking effect for admissible metal overabundance in Hyades stars. Known rotation and presence of Ap and Am stars in the Hyades and Pleiades apparently cannot account for the discrepancy.